PROCESS FOR POLYMERISING ETHYLENE

摘要

The invention concerns a method for producing ethylene homopolymers or copolymers comprising at least 90 mol % of units derived from ethylene which consists in: contacting in polymerising conditions, the monomers with a catalytic system including: (a) a catalytic solid comprising a metallocene o f a transition metal of groups 4 to 6 of the periodic table containing at leas t a cyclopentadiene ligand capable of being substituted, and a support, (b) at least an organoaluminium compound selected among compounds of general formul a (1): AITx(Y')yX'z wherein: T is a hydrocarbon group containing 1 to 30 carbo n atoms; Y' is a group selected among -OR', -SR' and NR'R'' with R' and R'' independently representing a hydrocarbon group containing 1 to 30 carbon atoms; X' is a halogen atom; x verifies the relationship 0 < x <=3; y verifies the relationship 0 <= y < 3; z verfies the relationship 0 <= z < 3, and x + y + z = 3, and (c) at least an ionic antistatic agent.